The Environmental Protection Agency (EPA) is approving a redesignation substitute demonstration provided by the State of Texas that the Houston-Galveston-Brazoria 1-hour ozone nonattainment area (HGB area) has attained the revoked 1-hour ozone National Ambient Air Quality Standards (NAAQS) due to permanent and enforceable emission reductions, and that it will maintain that NAAQS for ten years from the date of the EPA's approval of this demonstration.